I can't pair my Apple Watch
My watch is no longer connecting I’ve turned off and on both watch and phone
[Re-Titled by Moderator]
iPhone 13 Pro Max, iOS 16
Put your watch on its charger and keep it there until you complete the erase. (select the watch OS version)
Erase Apple Watch – Apple Support (UK)
Erasing all content and settings this way erases all media, data, and settings from your Apple Watch, but it does not remove Activation Lock if it has one.
Or if it is still under your iCloud account you can erase and remove it from your account in Find My or https://icloud.com/find .
Wait for the process to finish, then set up your Apple Watch again. Set up your Apple Watch – Apple Support (UK)
When asked, I suggest you set up as new.